EP2897971B1 - Method for producing a cyclic peptide - Google Patents
Method for producing a cyclic peptide Download PDFInfo
- Publication number
- EP2897971B1 EP2897971B1 EP13766034.6A EP13766034A EP2897971B1 EP 2897971 B1 EP2897971 B1 EP 2897971B1 EP 13766034 A EP13766034 A EP 13766034A EP 2897971 B1 EP2897971 B1 EP 2897971B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- acylase
- cyclic
- amino acid
- seq
- cyclic peptide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K7/00—Peptides having 5 to 20 amino acids in a fully defined sequence; Derivatives thereof
- C07K7/64—Cyclic peptides containing only normal peptide links
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P21/00—Preparation of peptides or proteins
- C12P21/02—Preparation of peptides or proteins having a known sequence of two or more amino acids, e.g. glutathione
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K7/00—Peptides having 5 to 20 amino acids in a fully defined sequence; Derivatives thereof
- C07K7/50—Cyclic peptides containing at least one abnormal peptide link
- C07K7/54—Cyclic peptides containing at least one abnormal peptide link with at least one abnormal peptide link in the ring
- C07K7/56—Cyclic peptides containing at least one abnormal peptide link with at least one abnormal peptide link in the ring the cyclisation not occurring through 2,4-diamino-butanoic acid
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/14—Hydrolases (3)
- C12N9/78—Hydrolases (3) acting on carbon to nitrogen bonds other than peptide bonds (3.5)
- C12N9/80—Hydrolases (3) acting on carbon to nitrogen bonds other than peptide bonds (3.5) acting on amide bonds in linear amides (3.5.1)
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P21/00—Preparation of peptides or proteins
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y305/00—Hydrolases acting on carbon-nitrogen bonds, other than peptide bonds (3.5)
- C12Y305/01—Hydrolases acting on carbon-nitrogen bonds, other than peptide bonds (3.5) in linear amides (3.5.1)
- C12Y305/01097—Acyl-homoserine-lactone acylase (3.5.1.97)
Definitions
- the present invention relates to a method for producing a cyclic peptide compound or a salt thereof by deacylating the acyl chain of a cyclic lipopeptide by means of an acylase.
- Cyclic peptides or cyclopeptides are polypeptides in which the terminal amine and carboxyl groups form an internal peptide bond.
- Several cyclic peptides are known for their advantageous medicinal properties. In nature cyclic peptides can range from just a few amino acids in length to hundreds. Cyclic peptides can be naturally occurring compounds but may also be obtained by total synthesis or by synthetic or genetic modification of naturally occurring or naturally produced precursors. The latter class is referred to as semi synthetic cyclic peptides.
- cyclic peptides bear one or more lipid tails or acyl chains, such cyclic peptides are referred to as cyclic lipopeptides.
- Cyclic lipopeptides with antibiotic activity include compounds such as daptomycin and amphomycin and an excellent example of cyclic lipopeptides is the class of echinocandins which are potent antifungals.
- Echinocandins are amphiphilic hexapeptides with an N-linked acyl lipid side chain and a molecular weight of approximately 1200 Da.
- Examples of medicinally useful echinocandins are the cyclic hexapeptides anidulafungin, caspofungin, cilofungin and micafungin which are useful in treating fungal infections, especially those caused by Aspergillus , Blastomyces , Candida , Coccidioides and Histoplasma.
- Anidulafungin (1-[(4 R ,5 R )-4,5-dihydroxy- N 2-[[4"-(pentyloxy)[1,1':4',1"-terphenyl]-4-yl]carbonyl]-L-ornithine]echinocandin B), caspofungin (1-[(4 R ,5 S )-5-[(2-aminoethyl)amino]- N 2-(10,12-dimethyl-1-oxotetradecyl)-4-hydroxy-L-ornithine]-5-[(3 R )-3-hydroxy-L-ornithine]-pneumocandin B 0 ) and micafungin (1-[(4 R ,5 R )-4,5-dihydroxy- N 2-[4-[5-[4-(pentyloxy)phenyl]-3-isoxazolyl]benzoyl]-L-ornithine]-4-[(4S
- Natural cyclic lipopeptides are typically produced by micro-organisms. Daptomycin is produced by the soil bacterium Streptomyces roseosporus. Amphomycin is produced by Streptomyces canus. Natural echinocandins such as echinocandin B, echinocandin C, aculeacin Ay, pneumocandin B 0 and FR 901379 are also typically produced by various micro-organisms. For example, echinocandin B is produced by the fungus Aspergillus nidulans and FR 901379 is produced by the fungus Coleophoma empetri.
- acyl chain of cyclic lipopeptides has shown to be an important determinant of antifungal activity and toxicity ( Debono M. & Gordee R.S., Annu. Rev. Microbiol. 48, 471 (1994 )).
- the naturally occurring cyclic antifungal lipopeptide FR 901379 bearing a fatty acid acyl group attached to the N-terminus shows potent in vivo antifungal activity ( Iwamoto, T., Fujie A., Nitta, K., Hashimoto, S., Okuhara, M., Kohsaka, M., J. Antibiot. 47, 1092 (1994 ).
- acylation of cyclic lipopeptides has been established by means of the Aculeacin A acylase from Actinoplanes utahensis.
- JP 4228072(A ) discloses an enzyme that catalyzes the deacylation of the lipid acyl portion of lipid cyclic peptide metabolites such as echinocandin B and aculeacin.
- JP 4075585 describes that this acylase can be cultured in Streptomyces as host organism. After Aculeacin A acylase is collected from a culture solution it is directly used to deacylate a substrate.
- EP 0885957 A1 describes cyclic lipopeptide acylases from the genus Streptomyces which are capable of deacylating the acyl chain of a cyclic lipopeptide compound, e.g. the abovementioned echinocandin FR 901379 or analogs thereof and a method of producing a cyclic peptide compound which comprises using said acylases.
- Polymyxin acylase used to deacylate the macrocyclic polymyxin E has been described in Shoji et al., 1975, Journal of Antibiotics 28, 764-769 , Kimura et al., 1987, Agricultural Biological Chemistry 51, 1617-1623 and Kimura et al., 1989, Agricultural Biological Chemistry 53, 497-504 .
- Application of polymyxin acylase in the deacylation of macrocyclic lipopeptides has been described in WO 01/05815 and WO 2006/063783 .
- N-acylhomoserine lactones have enzymatic activity against macrocyclic lipopeptides as reported in Park et al., 2005, Applied Environmental Microbiology 71, 2632-2641 and in Chen Chin-Nung et al., 2009, BMC Microbiology 9, 89-99 .
- the disadvantage of the above described methods for deacylation of cyclic lipopeptides is that it is not possible to produce the abovementioned acylases in a functional form and in a sufficient amount in an industrially preferred production host such as Escherichia coli or Bacillus.
- Production of acylase in Streptomyces or Actinoplanes utahensis is not preferred in an industrial setting because it leads to relatively low enzyme yields because of low expression levels in these organisms and because these organisms are less suitable for use in fermenter systems.
- use of Streptomyces lividans in fermenter systems often leads to problems with respect to viscosity which prevents that high cell densities are obtained.
- the present invention aims to improve deacylation of cyclic lipopeptides on industrial scale by providing a method that applies an acylase that is producible in a functional form in an industrially preferred production host.
- the present invention relates to a method for producing a cyclic peptide compound or a salt thereof which comprises contacting a cyclic lipopeptide compound or a salt thereof with an acylase derived from a microorganism belonging to the genus Pseudomonas to deacylate the lipid acyl moiety of said cyclic lipopeptide.
- the obtained cyclic peptide may be subjected to an additional step of reacylating said cyclic peptide resulting in a reacylated cyclic peptide.
- Reacylating the cyclic peptide usually involves a process of synthesizing the new acyl chain for the cyclic peptide, followed by a process of coupling the acyl chain to the free amino group of the cyclic peptide.
- the acyl chain of the reacylated cyclic peptide may be further processed resulting in a further processed reacylated cyclic peptide. This can be done by any suitable chemical, semi-chemical or enzymatic method.
- the process of reacylating is usually followed by purification of the thus obtained new cyclic lipopeptide to the right quality and/or crystal form.
- a process of synthesizing a new acyl chain may be any method that is known to the skilled person such as total chemical synthesis or semi-synthesis, i.e. fermentation followed by one or more chemical conversions.
- One example of a process of reacylation of a cyclic peptide may be the chemical synthesis of an acyl chain from 1-bromooctane and 4-hydroxybenzoic acid followed by the coupling of the resulting 2,4,5-trichlorophenyl 4-(n-octyloxy)benzoate to a free amino group of a deacylated derivative of FR 901379 as described in Fujie, Pure Appl. Chem. 79, No. 4, pp.603-614 (2007 ).
- the process of production of a cyclic lipopeptide according to the invention may for instance result in micafungin or a salt thereof.
- the reacylated cyclic peptide or further processed reacylated cyclic peptide described above may thus be micafungin or a salt thereof.
- the process of producing micafungin starts with production of FR 901379. This may be realized by fermentation by Coleophoma empetri followed by downstream processing to obtain the required purity of FR 901379 or a salt thereof.
- the acyl side chain of FR 901379 has to be removed.
- expression of the acylase from Pseudomonas in an industrially preferred production strain is realized, followed by downstream processing and formulation of the enzyme. This is followed by the biocatalytic process in which the acyl side chain of FR 901379 is removed leading to a micafungin precursor.
- micafungin In order to synthesize micafungin from its precursor first an appropriate side chain must be available. For micafungin this is a 3,5-diphenyl-substituted isoxazole. Side chains may be synthesized using techniques that are known to the skilled person. The side chain is subsequently coupled to the micafungin precursor by regular chemical, semi chemical or enzymatic methods. After optional further processing of the new acyl chain, micafungin is purified to obtain the right quality and crystal form. Any suitable method, which may be known to the skilled person for purification of the desired cyclic peptide to the right quality and/or crystal form may be applied.
- the cyclic lipopeptide compound may be a cyclic lipopeptide such as daptomycin or amphomycin or a derivative thereof or a cyclic lipopeptide of the class of echinocandins.
- the cyclic lipopeptide is an echinocandin derivative.
- Echinocandins are compounds of general formula ( 1 ), wherein R is a hydrogen or an acyl group; R 1 is -H or -OH; R 2 is -H or -CH 3 ; R 3 is -H, -CH, -CH 2 CONH 2 or -CH 2 CH 2 NH 2 ; R 4 is -H or -OH; R 5 is -OH, -OPO 3 H 2 , or -OSO 3 H, R 6 is -H or -OSO 3 H and R 7 is -H or CH 3 .
- Echinocandin derivatives may comprise any suitable enantiomer, and in a derivative R and R 1 - 7 may have a different designation than described above.
- the preferred salts are conventional nontoxic mono- or di-salts. These include metal salts such as alkali metal salts, alkaline earth metal salts, ammonium salts, salts with organic bases, organic acid addition salts, inorganic acid addition salts and salts with amino acids.
- metal salts such as alkali metal salts, alkaline earth metal salts, ammonium salts, salts with organic bases, organic acid addition salts, inorganic acid addition salts and salts with amino acids.
- acyl (IUPAC name: alkanoyl) group is usually derived from a carboxylic acid.
- acyl in "acylamino" or “acyl” group may include aliphatic acyl, aromatic acyl, heterocyclic acyl, aryl-substituted aliphatic acyl, and heterocyclic-substituted aliphatic acyl derived from carboxylic acids, carbonic acids, carbamic acids, and sulfonic acids.
- acyl may include lower alkanoyl, higher alkanoyl, lower alkenoyl, higher alkenoyl, higher alkoxycarbonyl, ar(lower)alkoxycarbonyl, lower alkylsulfonyl, arylsulfonyl, ar(lower)alkylsulfonyl, aroyl, lower alkyl, higher alkyl, higher alkoxy, higher alkenyloxy, carboxy and aryloxy, including derivatives of these with any suitable substituent(s).
- the acyl group to be deacylated while using the method of the invention is preferably a higher alkanoyl group, such as a fatty acid acyl group.
- a fatty acid acyl group may for example be a palmitoyl group or a myristate group.
- Pneumocandins for example have a hydrophobic dimethylmyristate tail connected via an amide bond to the alpha-amino group of its hydroxylated ornithine residue.
- An echinocandin derivative suitable for use in the method of the invention may be selected from the group consisting of FR 901379, echinocandin B, aculeacin A and pneumocandin A, B or C.
- An echinocandin that may be particularly suited for the method of the invention is Substance FR 901379 or analogs thereof with the general formula ( 1 ), in which R is acyl, R 1 is -OH, R 2 is -CH 3 , R 3 is CH 2 C(O)NH 2 , R 4 is -OH, R 5 is OH, R 6 is -OSO 3 H and R 7 is CH 3 .
- deacylation of a cyclic lipopeptide means that a side chain acylamino group of said cyclic lipopeptide is deacylated to an amino group.
- the deacylated compound is represented by the general formula ( 2 ), wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 and R 7 are as defined above for Formula (1).
- the deacylation reaction may take place in any suitable medium.
- the pH is preferably near physiological, for instance from 5 to 10, preferably from 6 to 9, still more preferably from 6.5 to 8.5 such as about 8, and may, if desired, be adjusted by adding an amount of acid or base.
- the temperature at which deacylation is carried out is not very critical and may be from 0 to 50°C, preferably from 5 to 40°C. A suitable temperature may for example be a temperature between 20 and 30°C.
- the acylase that is used to deacylate the lipid acyl moiety of a cyclic lipoprotein according to the method of the invention is an acylase produced by a microorganism belonging to the genus Pseudomonas, which includes Pseudomonads of the Pseudomonas aeruginosa, Pseudomonas syringae , Pseudomonas putida, Pseudomonas pertucinogena, Pseudomonas fluorescens, Pseudomonas chlororaphis and Pseudomonas stutzeri groups.
- the acylase applied in the method of the invention is preferably derived from Pseudomonas aeruginosa.
- the term "derived from” is meant to include an acylase that originates from a Pseudomonas species as well as an artificial variant thereof.
- the acylase originates from a Pseudomonas species.
- a gene encoding such said acylase is made artificially on the basis of a known gene or protein sequence such as the sequences SEQ ID NO: 1 and SEQ ID NO: 2 disclosed herein.
- a gene encoding said acylase originating from Pseudomonas is artificially modified, which may lead to an artificial variant of said acylase which may be applicable in the method of the invention.
- an acylase from Pseudomonas is capable of removing the acyl chain of cyclic lipopeptides.
- the major advantage of using an acylase of Pseudomonas is that these acylases can be conveniently expressed in industrially preferred production hosts.
- the acylase is obtained from an organism transformed with a vector encoding an acylase derived from Pseudomonas.
- Such an organism may be a bacterium or a yeast and is preferably selected from the group consisting of Escherichia coli , Bacillus , Pichia pastoris and Kluyveromyces lactis.
- a non-pathogenic Pseudomonas host may also be a good host organism to produce an acylase in.
- Such a non-pathogenic Pseudomonas host may be for instance Pseudomonas alcaligenes.
- the acylase may as well be produced in fungi, such as Aspergillus nidulans, Aspergillus niger and Aspergillus oryzae.
- An acylase that is particularly preferred is the protein PvdQ of Pseudomonas aeruginosa PA01, which has the amino acid sequence as set forth in SEQ ID NO:1 ( Huang et al., 2003 Appl. Environ. Microbiol. 69: 5941-5949 ), or a functional equivalent homologue thereof.
- PvdQ was initially identified as an acyl homoserine lactone (AHL) acylase ( Sio et al, Infect Immun. 2006 Mar; 74 (3): 1673-82 ).
- AHL acylases can degrade AHLs to produce fatty acid and homoserine lactone. This way AHL acylases can regulate quorum sensing activity in the bacteria. Surprisingly however, such an AHL acylase can also be applied to deacylate cyclic lipopeptides.
- the AHL acylases are initially produced as a protein consisting of a signal peptide, an N-terminal alpha subunit or small subunit, a C-terminal beta subunit or large subunit and a so-called spacer peptide between the small alpha and the large beta subunit.
- a protein is referred to as preproprotein.
- the process of maturation of the preproprotein to an active enzyme comprises the removal of the signal peptide followed by an intramolecular cleavage of the remaining peptide chain into the small alpha and the large beta subunit and finally a part of the C-terminal amino acids of the small subunit (the spacer peptide) is removed.
- the acylase is preferably for a large part in its mature form.
- sequence set forth in SEQ ID NO: 1 represents a preproprotein and the gene with the sequence set forth in SEQ ID NO: 2 encodes this preproprotein.
- the signal peptide is comprised in the amino acid residues 1-23.
- the size of the alpha subunit is approximately 18.5 kDa and the size of the beta subunit is approximately 60.4 kDa.
- acylases having the amino acid sequence of SEQ ID NO: 1 can be used in the method of the invention.
- the acylase used in the method of the invention therefore also encompasses derivatives and homologues of SEQ ID NO: 1.
- Protein sequences may be altered by substitutions, additions or deletions. Such protein sequences however may still encode functionally equivalent proteins or function-conservative variants.
- several of the amino acids share similar properties. Arginine, lysine and histidine for example are positively charged at physiological pH. Aspartate and glutamate are negatively charged.
- Alanine, valine, isoleucine and leucine are small hydrophobic amino acids. Substitution of one or more amino acids within a protein sequence for another amino acid with the same properties therefore often leads to a functionally equivalent protein. For example, a substitution of valine for leucine within a protein sequence is usually not expected to influence protein functionality.
- sequence identity in order to determine the percent identity of two amino acid sequences or of two nucleic acid sequences, the complete sequences are aligned for optimal comparison purposes. In order to optimize the alignment between the two sequences gaps may be introduced in any of the two sequences that are compared. Such alignment is carried out over the full length of the sequences being compared. Alternatively, the alignment may be carried out over a shorter length, for example over about 20, about 50, about 100 or more nucleic acids/based or amino acids. The identity is the percentage of identical matches between the two sequences over the reported aligned region.
- a comparison of sequences and determination of percent identity between two sequences can be accomplished using a mathematical algorithm.
- the skilled person will be aware of the fact that several different computer programs are available to align two sequences and determine the homology between two sequences ( Kruskal, J. B. (1983) An overview of sequence comparison in D. Sankoff and J. B. Kruskal, (ed.), Time warps, string edits and macromolecules: the theory and practice of sequence comparison, pp. 1-44 Addison Wesley ).
- the percent identity between two amino acid sequences can be determined using the Needleman and Wunsch algorithm for the alignment of two sequences. ( Needleman, S. B. and Wunsch, C. D. (1970) J. Mol. Biol. 48, 443-453 ).
- the algorithm aligns amino acid sequences as well as nucleotide sequences.
- the Needleman-Wunsch algorithm has been implemented in the computer program NEEDLE.
- the NEEDLE program from the EMBOSS package was used ( version 2.8.0 or higher, EMBOSS: The European Molecular Biology Open Software Suite (2000) Rice, P. Longden, I. and Bleasby, A. Trends in Genetics 16, (6) 276-277, http://emboss.bioinformatics.nl/ ).
- EBLOSUM62 is used for the substitution matrix.
- EDNAFULL is used for nucleotide sequences.
- Other matrices can be specified.
- the optional parameters used for alignment of amino acid sequences are a gap-open penalty of 10 and a gap extension penalty of 0.5. The skilled person will appreciate that all these different parameters will yield slightly different results but that the overall percentage identity of two sequences is not significantly altered when using different algorithms.
- the homology or identity is the percentage of identical matches between the two full sequences over the total aligned region including any gaps or extensions.
- the homology or identity between the two aligned sequences is calculated as follows: Number of corresponding positions in the alignment showing an identical amino acid in both sequences divided by the total length of the alignment including the gaps.
- the identity defined as herein can be obtained from NEEDLE and is labeled in the output of the program as "IDENTITY".
- the homology or identity between the two aligned sequences is calculated as follows: Number of corresponding positions in the alignment showing an identical amino acid in both sequences divided by the total length of the alignment after subtraction of the total number of gaps in the alignment.
- the identity defined as herein can be obtained from NEEDLE by using the NOBRIEF option and is labeled in the output of the program as "longest-identity".
- the level of identity (homology) between two sequences is calculated according to the definition of "longest-identity" as can be carried out by using the program NEEDLE.
- the protein sequences of the present invention can further be used as a "query sequence" to perform a search against sequence databases, for example to identify other family members or related sequences. Such searches can be performed using the BLAST programs.
- Software for performing BLAST analyses is publicly available through the National Center for Biotechnology Information (http://www.ncbi.nlm.nih.gov).
- BLASTP is used for amino acid sequences and BLASTN for nucleotide sequences.
- the BLAST program uses as defaults:
- the degree of local identity (homology) between the amino acid sequence query or nucleic acid sequence query and the retrieved homologous sequences is determined by the BLAST program. However only those sequence segments are compared that give a match above a certain threshold. Accordingly the program calculates the identity only for these matching segments. Therefore the identity calculated in this way is referred to as local identity.
- the acylase encoded by abovementioned vector that is used in the method of the invention therefore is a protein which has an amino acid sequence as set forth in SEQ ID NO: 1, or an amino acid sequence with a sequence identity in the range between 50 and 100% thereto.
- sequence identity is comprised between 60 and 100%, more preferably between 70 and 100%, more preferably between 80 and 100%, more preferably between 85 and 100%, more preferably between 90 and 100%, more preferably between 95 and 100%, most preferably between 98 and 100%.
- the acylase used in the method of the invention preferably encompasses acylases with a sequence identity of between 90 and 100% with the acylase protein of Pseudomonas aeruginosa PA01 represented by SEQ ID NO: 1 (or at least the mature acylase thereof).
- Such acylases are preferably derived from Pseudomonas aeruginosa such as the acylases from Pseudomonas aeruginosa strains DK2, PAb1, M18, C3719, MPA01/P1, LESB58, PACS2, 39016, 2192, NCMG1179, PA7, PADK2_CF510.
- the acylase preparation that is used in the method of the invention may be a crude enzyme solution or a purified enzyme.
- the acylase preparation may also be composed of cells, either permeated or immobilized, that exhibit acylase activity or a homogenized cell suspension that exhibits acylase activity.
- the acylase is produced in an industrially preferred production organism such as Escherichia coli in a fermenter. Cells are harvested and lysed with for instance a lysis buffer containing lysozyme to prepare the acylase preparation. Preferably lysed cells are then centrifuged and the soluble protein fraction containing the acylase is used as a crude enzyme preparation in the method of the invention.
- the crude or purified enzyme solution of acylase has been obtained from a production host such as Escherichia coli.
- a production host such as Escherichia coli.
- the gene encoding the acylase is isolated from the Pseudomonas genome, amplified and cloned into an expression vector.
- the expression vector can then be transformed into a host organism.
- Heterologous expression of a Pseudomonas acylase may be realized using various molecular biology techniques which are known to the skilled person.
- Preferred alternative Escherichia coli host strains which can be used for industrial production of protein comprise Escherichia coli DH10B, Escherichia coli BL21, K12 strain RV308, Escherichia coli DH5, Escherichia coli JM109, Escherichia coli XL-1 and derivatives of these strains.
- Such derivatives may comprise specific knock-outs or mutations which are beneficial for recombinant protein production and/or the use of certain desired markers and/or promoters.
- Various examples can be found at http://wolfson.huji.ac.il/expression/bac-strains-prot-exp.html.
- a gene encoding said acylase can be synthesized in order to be codon optimized for its host organism. Different organisms often show different preferences for one of the several codons that encode the same amino acid. Such a preference occurs when a greater frequency of a particular codon is found than expected by chance. Codon preference is thought to play a role in particular in fast-growing bacteria such as Escherichia coli, wherein the genomic tRNA pool reflects the codon preference. If high amounts of proteins should be expressed in such an organism, optimal codons could help to achieve faster translation rates and thus more protein production. Codon optimization could in particular be relevant in case of heterologous expression as is the case in the present invention, wherein a Pseudomonas protein is expressed in a preferred industrial fermentation organism such as Escherichia coli.
- Another way to optimize protein production in a preferred industrial fermentation strain such as Escherichia coli may be to use an alternative signal peptide.
- proteins such as the AHL acylase of Pseudomonas are initially synthesized as a preproprotein.
- the nucleotide sequence coding for the AHL acylase without a signal peptide can be operably linked to a nucleotide sequence coding for a signal peptide from another species which also permits secretion of the preproprotein over the cytoplasmic membrane into the periplasm. Exchanging the signal peptide of a given protein for another might favor secretion of the protein in an industrially preferred production host organism and thus help to achieve more and faster protein production.
- expression constructs may be in promoters expressing the genes, way of induction or in copy number (low, medium, or high) of the plasmids.
- genes are expressed by either an inducible or a constitutive promoter using a low, medium, or high copy expression vector.
- SEQ ID NO: 2 represents the DNA sequence of the gene encoding the wild-type acylase from Pseudomonas aeruginosa PA01 with its native signal peptide.
- the amino acid sequence of the protein encoded by this DNA sequence is set forth in SEQ ID NO: 1.
- the signal peptide represents residues 1-23 of SEQ ID NO: 1.
- This gene was re-cloned from the original vector used by the synthesis vendor (DNA2.0) into a pTAC low copy expression vector behind a wild-type IPTG inducible tac promoter using specific restriction sites. Subsequently the expression construct was transformed into an Escherichia coli DH10B expression host. Recombinant colonies were selected by antibiotic resistance (kanamycin) and analyzed by restriction digestion. Bacteria were grown in duplo in 24 wells microtiter plates using conditions as follows.
- the expression of the acylase gene was analyzed using qualitative SDS-PAGE.
- qualitative SDS-PAGE the cell pellets were collected by centrifugation at 14,000 rpm for 1 minute in a bench-top Eppendorf centrifuge and were dissolved in lysis buffer (100 mM Tris/HCI, 0.1 mg/ml DNAse, 2.0 mg/ml Lysozyme, 25 ⁇ M MgSO 4 ) and incubated for 30 minutes at 37°C. Samples were fractionated by centrifugation and lysed cell pellets were centrifuged for 1 minute at 14,000 rpm in a bench-top Eppendorf centrifuge and the soluble protein fraction was transferred into a fresh mini tube. Pellets were dissolved in an equal volume of the Phosphate Buffered Saline (PBS) buffer. 6.5 ⁇ l of the supernatant and 6.5 ⁇ l of the pellet fraction were used for SDS-PAGE analysis.
- PBS Phosphate Buffered Saline
- Bacteria were grown using conditions as described in the previous paragraph. Final growth is performed in a 100 ml shake-flask, with foam plug, containing 10 mL medium, at 30°C and 280 rpm.
- the bacteria were grown in Slow Glucose Release Medium (in presence or absence of 100 ⁇ g/ml kanamycin) in 100 mL Shake-Flask. Selected strains were grown using conditions as described above. Cell pellets were collected by centrifugation at 14,000 rpm for 1 minute in a bench-top Eppendorf centrifuge and were dissolved in lysis buffer (100 mM Tris/HCl, 0.1 mg/ml DNAse, 2.0 mg/ml Lysozyme, 25 ⁇ M MgSO 4 ) and incubated for 30 minutes at 37°C. Samples were fractionated by centrifugation and lysed cell pellets were centrifuged for 1 minute at 14,000 rpm in a bench-top Eppendorf centrifuge and the soluble protein fraction was transferred into a fresh mini tube.
- lysis buffer 100 mM Tris/HCl, 0.1 mg/ml DNAse, 2.0 mg/ml Lysozyme, 25 ⁇ M MgSO 4
- the enzyme reaction was stopped by dilution of the reaction mixture with 2% phosphoric acid 1:1 (v/v). Subsequently the reaction mixture was applied to a UPLC chromatography system coupled to a mass spectrometer for the determination of pneumocandin B 0 (substrate), deacylated pneumocandin B 0 (product) and its hydrolysis product (deacylated pneumocandin B 0 -H 2 O).
- the enzyme reaction was stopped by dilution of the reaction mixture with 2% phosphoric acid 1:1 (v/v). Subsequently the reaction mixture was applied to a UPLC chromatography system coupled to a mass spectrometer for the determination of FR 901379 (substrate), deacylated FR 901379 (product) and its hydrolysis product (deacylated FR 901379-H 2 O).
- Mass spectrometer Instrument Parameters - Function 1 Polarity ES+ Calibration Static 1 Capillary (kV) 3.00 Cone (V) 40.00 Extractor (V) 1.00 RF Lens (V) 1.0 Source Temperature (°C) 120 Desolvation Temperature (°C) 350 Cone Gas Flow (L/h) 100 Desolvation Gas Flow (L/h) 500 496 LM 1 Resolution 15.0 HM 1 Resolution 15.0 Ion Energy 1 0.5 Entrance 40 Collision 0 Exit 40 LM 2 Resolution 15.0 HM 2 Resolution 15.0 Ion Energy 2 0.5 Multiplier (V) 700 Syringe Pump Flow (uL/min) 20.0 Gas Cell Pirani Pressure (mbar) ⁇ 1e-4 mbar
- the acylase from Pseudomonas aeruginosa shows activity towards cyclic lipopeptides.
- a vector encoding the amino acid sequence as set forth in SEQ ID NO: 1 is therefore suitable for use in the method of the invention. This example shows that by using a Pseudomonas acylase in a method of producing cyclic peptides from cyclic lipopeptides it becomes possible to produce a cyclic peptide from a cyclic lipopeptide in an efficient way.
- the method of the invention makes it possible to produce a cyclic peptide from a cyclic lipopeptide in an efficient way, because the Pseudomonas acylase can be produced in an industrially preferred production organism (in this example Escherichia coli ).
- the acylase cleaves off a 10,12-dimethyl-myristoyl acyl moiety.
- Another cyclic lipopeptide containing a 10,12-dimethyl-myristoyl acyl moiety is sporiofungin A.
- the acylase will also deacylate sporiofungin A.
- the acylase cleaves off a palmitoyl acyl moiety.
- Aculeacin A, FR 209602 and cryptocandin also carry the palmitoyl acyl moiety and therefore are also suitable to be deacylated by the acylase.
- the 3D structure of the mature quorum quenching n-acyl homoserine lactone acylase from Pseudomonas aeruginosa PA01 (PvdQ, represented by amino acid residues 24 to 762 of SEQ ID NO: 1) as determined by M. Bokhove et al. (2010), Proc Natl Acad Sci USA 107,686-691 was taken as a model.
- the atomic coordinates are available from the Protein Data Bank by accession code 2WYB.
- the inventors used the molecular modeling package Maestro (Schrödinger) to visualize the 3D structure of 2WYB which contains a covalently bound dodecanoic acid in the active site.
- the dodecanoic acid was used to map the active site of the acylase in order to determine the amino acids that contribute to its substrate specificity which surprisingly includes the deacylation of cyclic lipopeptides.
- Residues in the active site can be divided in so-called first shell amino acids and second shell amino acids.
- the first shell amino acids are those amino acids which interact directly with the dodecanoic acid via electrostatic interactions, hydrogen bonding, hydrophobic interactions and/or van der Waals forces.
- the second shell amino acids are considered.
- the second shell residues are identified by measuring which amino acids have at least one atom within a sphere of 7 Angstroms around a first shell amino acid.
- the inventors used the dodecanoic acid as a guide to determine the docking of cyclic lipopeptides (e . g . pneumocandin B 0 , FR 90139) into the active site.
- the resulting complexes can be used to extend the mapping of the active site towards the cyclic peptide moiety of the substrate in the same way as described for the dodecanoic acid.
- comparative modeling using the modeling software package Prime was applied. It should be understood that alternative software tools with similar functionality are available for comparative modeling e.g.
- homologous proteins in this aspect originate from Pseudomonas species and show at least 50% sequence identity (such as 60, 70, 80, 85, 90, 95, or 98 % sequence identity) with SEQ ID NO: 1.
- sequence identity such as 60, 70, 80, 85, 90, 95, or 98 % sequence identity
- Motif i) corresponds, as determined by protein sequence alignment, to the amino acid residues at positions 161-174 of SEQ ID NO: 1, wherein the amino acid residues V or T at position 166, L at position 169 and L or M at position 170 are first shell residues contacting the substrate.
- Motif ii) corresponds, as determined by protein sequence alignment, to the amino acid residues at positions 266-273 of SEQ ID NO: 1, wherein the amino acid residues L or I at position 266, L at position 269 and N at position 273 are first shell residues contacting the substrate.
- Motif iii) corresponds, as determined by protein sequence alignment, to the amino acid residues at positions 373-378 of SEQ ID NO: 1, wherein the amino acid residues V at position 374, L at position 375 and W at position 378 are first shell residues contacting the substrate.
- Motif iv corresponds, as determined by protein sequence alignment, to the amino acid residues at positions 284-291 of SEQ ID NO: 1, wherein the amino acid residues H at position 284, T at position 285 and V at position 286 are first shell residues contacting the substrate.
- the vector used in the method of the invention preferably encodes an acylase that has an amino acid sequence that has between 50 and 100 % (such as between 50, 60, 70, 80, 85, 90, 95 or 99 and 100%) sequence identity with respect to the amino acid sequence set forth in SEQ ID NO: 1, wherein the amino acid sequence of said acylase contains the following sequence motifs:
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EP3630794A4 (en) * | 2017-05-27 | 2021-03-03 | The Rockefeller University | MALACIDINS AND METHODS OF USE |
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FR901379A (fr) | 1943-09-10 | 1945-07-25 | Télégraphie par variations de fréquence | |
EP0460882B1 (en) | 1990-06-07 | 1996-07-24 | Eli Lilly And Company | Lipopeptide deacylase |
KR100545506B1 (ko) * | 1996-03-08 | 2006-10-04 | 아스테라스 세이야쿠 가부시키가이샤 | 환상 리포펩티드 물질의 탈아실화 방법 |
US6323176B1 (en) * | 1998-02-25 | 2001-11-27 | Eli Lilly And Company | Cyclic peptide antifungal agents |
HUP0202315A2 (en) * | 1999-07-15 | 2002-10-28 | Lilly Co Eli | Process for deacylation of lipodepsipeptides |
EP1470221B1 (en) * | 2002-01-23 | 2007-03-21 | Agency for Science, Technology and Research | Ralstonia ahl-acylase gene |
WO2003068210A1 (en) * | 2002-02-12 | 2003-08-21 | Hunza Di Pistolesi Elvira & C. S.A.S. | N-acyl-phosphatidyl-ethanolamines and/or mixtures of n-acyl-ethanolamines with phosphatidic acids or lysophosphatidic acids |
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DE102004060750A1 (de) * | 2004-12-15 | 2006-07-13 | Sanofi-Aventis Deutschland Gmbh | Verfahren zur Deacylierung von Lipopeptiden |
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